Audio transducer with high aspect ratio actuator

1 . A device comprising:

an audio transducer including an actuator having:

a voice-coil including a first surface and a second surface,

a first magnetic assembly disposed adjacent to the first surface, the first magnetic assembly including a first magnetic element and a second magnetic element,

a second magnetic assembly disposed adjacent to the second surface, the second magnetic assembly including a third magnetic element and a fourth magnetic element,

a first post coupled to the voice-coil,

a second post coupled to the voice-coil,

a first flexure coupled to the first post, wherein the first flexure includes:

a first layer comprising a first metal flexure spring, and

a second layer comprising pressure sensitive adhesive, and

a second flexure coupled to the second post, wherein the second flexure includes:

a third layer comprising a second metal flexure spring, and

a fourth layer comprising pressure sensitive adhesive; and

a housing in which the audio transducer is at least partially disposed,

wherein the first magnetic assembly includes:

a first plate,

a first arm extending from the first plate in a first direction, and

a second arm extending from the first plate in a second direction opposite the first direction; and

wherein the second magnetic assembly includes:

a second plate,

a third arm extending from the second plate in a third direction, and

a fourth arm extending from the second plate in a fourth direction opposite the third direction.

2 . The device of claim 1 , further comprising a frame including:

a first receptacle in which the first arm is at least partially disposed;

a second receptacle in which the second arm is at least partially disposed;

a third receptacle in which the third arm is at least partially disposed; and

a fourth receptacle in which the fourth arm is at least partially disposed.

3 . The device of claim 1 , wherein:

a first magnetic flux flows from the first magnetic element to the third magnetic element; and

a second magnetic flux flows from the fourth magnetic element to the second magnetic element.

4 . The device of claim 1 , further comprising a former having the voice-coil, wherein:

the first post couples to the former; and

the second post couples to the former.

5 . An audio transducer comprising:

a frame; and

a voice-coil at least partially disposed within the frame, the voice-coil including:

a first substantially flat side,

a second substantially flat side, and

an actuator at least partially coupled to the frame, the actuator including:

a first magnetic element disposed adjacent to the first substantially flat side of the voice-coil,

a second magnetic element disposed adjacent to the first substantially flat side of the voice-coil,

a third magnetic element disposed adjacent to the second substantially flat side of the voice-coil, wherein a first magnetic flux flows from the first magnetic element to the third magnetic element,

a fourth magnetic element disposed adjacent to the second substantially flat side of the voice-coil, wherein a second magnetic flux flows from the fourth magnetic element to the second magnetic element,

a first plate having the first magnetic element and the second magnetic element, the first plate having a first arm and a second arm extending from opposite ends thereof, and

a second plate having the third magnetic element and the fourth magnetic element, the second plate having a third arm and a fourth arm extending from opposite ends thereof.

6 . The audio transducer of claim 5 , wherein:

the frame includes:

a first receptacle in which the first arm is at least partially disposed,

a second receptacle in which the second arm is at least partially disposed,

a third receptacle in which the third arm is at least partially disposed, and

a fourth receptacle in which the fourth arm is at least partially disposed.

7 . The audio transducer of claim 5 , wherein:

a first distance is disposed between the first magnetic element and the voice-coil;

a second distance is disposed between the second magnetic element and the voice-coil;

a third distance is disposed between the third magnetic element and the second substantially flat side;

a fourth distance is disposed between the fourth magnetic element and the second substantially flat side; and

the first distance, the second distance, the third distance, and the fourth distance are substantially similar.

8 . The audio transducer of claim 5 , further comprising:

a first flexural spring coupled to the voice-coil; and

a second flexural spring coupled to the voice-coil.

9 . The audio transducer of claim 8 , further comprising:

a former to which the voice-coil couples;

a first post coupled to a first side of the former; and

a second post coupled to a second side of the former,

wherein the first flexural spring couples to the first post and the frame, and

wherein the second flexural spring couples to the second post and the frame.

10 . The audio transducer of claim 9 , wherein the former includes a top defining one or more tabs, further comprising a cone including having one or more slots through the one or more tabs are disposed, respectively.

11 . The audio transducer of claim 8 , wherein at least one of:

the first flexural spring includes a first metal layer and one or more first dampening layers; or

the second flexural spring includes a second metal layer and one or more second dampening layers.

12 . The audio transducer of claim 5 , wherein the voice-coil comprises a flat coil.

13 . An actuator comprising:

at least one voice-coil;

a first magnetic element disposed adjacent to a first side of the at least one voice-coil;

a second magnetic element disposed adjacent to the first side of the at least one voice-coil;

a third magnetic element disposed adjacent to a second side of the at least one voice-coil;

a fourth magnetic element disposed adjacent to the second side of the at least one voice-coil;

a first flexural spring coupled to the at least one voice-coil;

a second flexural spring coupled to the at least one voice-coil;

a first plate having a first arm and a second arm extending therefrom in opposite directions, the first magnetic element and the second magnetic element being disposed on the first plate; and

a second plate having a third arm and a fourth arm extending therefrom in opposite directions, the third magnetic element and the fourth magnetic element being disposed on the second plate.

14 . The actuator of claim 13 , further comprising a frame, wherein:

the first flexural spring couples to the frame; and

the second flexural spring couples to the frame.

15 . The actuator of claim 13 , wherein:

the at least one voice-coil includes a first track and a second track;

the first track is disposed between the first magnetic element and the third magnetic element; and

the second track is disposed between the second magnetic element and the fourth magnetic element.

16 . The actuator of claim 13 , further comprising a frame including a first receptacle and a second receptacle disposed on a first side of the frame, and a third receptacle and a fourth receptacle disposed on a second side of the frame, wherein:

the first arm is at least partially disposed in the first receptacle;

the second arm is at least partially disposed in the second receptacle;

the third arm is at least partially disposed in the third receptacle; and

the fourth arm is at least partially disposed in the fourth receptacle.

17 . The actuator of claim 13 , wherein:

the first flexural spring includes at least one dampening layer; and

the second flexural spring includes at least one dampening layer.